Over time, I think humans will become essentially immortal.
Looking at current trends in technology, it is not a leap to consider humanity may be on the verge of an unprecedented leap forward. We may cure death within the next hundred years. In 300 years, we might even be challenged with what it means to be human when our physical bodies are no longer necessary (and might be a liability).
When that happens, we will be able to travel farther than we can imagine and with unlimited resources and lifespans to throw at the universe’s biggest problems, we could potentially solve issues like being able to travel faster than light. What would that look like? (Well… I suppose it would not look like anything because if we were moving faster than light, we would be unable to see what is ahead!)
If we can beat the barriers imposed by Relativity and move faster than light, we would also have access to purely science fiction technology like time travel.
Consider this: when we look into space, we look into the past. It takes time for the light of other objects to reach our eyes, even someone standing in front of you. Light travels so fast (about 186,000 miles per second!) it seems like you see people and things instantly. Of course, that is not true. It takes time for light to reach your eyes because light has to cross the space between the object you are looking at and you, the same way your body has to cross space to reach the other side of a room.
Bigger spaces require more time for light to cross. When we look at the nearest galaxy to our own (the Andromeda galaxy), we are seeing it as it was about 2 million years ago. The space between our own Milky Way galaxy and the Andromeda galaxy is so great it took the light, traveling 186,000 miles per second, about 2 million years to reach our telescopes! That means they also see our galaxy as it was 2 million years ago. If someone in the Andromeda galaxy today could see Earth, they would see dinosaurs roaming the planet now. You and I have not even been born!
You do not have to travel to another galaxy to grasp this concept, though. Just think of how we have other time zones on our planet. Some of us appear to be either 3 hours in the future or 3 hours in the past from others. It is not the same, of course, but it is an easier scale to understand.
Because you and I reflect light, too, we can think of our lives as channels on television being broadcast forever, until it reaches the edge of space. We are the ultimate reality TV shows for the universe! That means if you can race faster than the signal (light) of your own life, then theoretically you could be in front of it to be there when it reaches you and you could watch your life again!
If we want to travel backward in time, the trick will be to out race light. This raises more questions than I can possibly explore in a series of posts (or even in a hundred years of blogging about it) but it is a fun thought experiment, and in a few hundred years, it may not be an experiment at all. We may be dealing with the results of that experiment (or we may already be dealing with it!).
Here is the core of today’s lesson: when you think about it… really, truly, quite literally… anything is possible.